Nitrogen-Ceramic Target Sputtering for Metal Oxide Layer Stability
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Solution Overview
Problem
Existing methods for depositing metal oxide layers, such as in insulating glazing, face challenges in achieving stable process control and reducing mechanical and chemical stresses due to high-energy oxygen bombardment, especially when using oxygen-containing targets or metallic targets in oxygen atmospheres, which affect the layer's chemical stability and mechanical strength.
Innovation Solution
The method involves using a nitrogen-containing ceramic target in an oxygen-containing sputtering atmosphere to deposit metal oxide layers, where the nitrogen in the target material reduces arcing and bombardment, allowing for a high oxygen flow and stable deposition of predominantly oxidic layers with improved hysteresis behavior, enabling the production of optically transparent and mechanically stable layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If oxygen-containing ceramic targets are used to deposit metal oxide layers, then the deposition process can proceed with lower oxygen content in the process gas, but high-energy oxygen bombardment from the target material causes undesirable stresses in the deposited layer
Solution Approach 1:
A nitrogen-containing ceramic layer is introduced as an intermediary between the oxygen-containing process atmosphere and the substrate. This intermediary layer allows oxygen to be present in the process gas for deposition while preventing direct high-energy oxygen bombardment of the substrate, thus avoiding mechanical stresses in the deposited metal oxide layer
Solution Approach 2:
The harmful oxygen bombardment is extracted or removed from the deposition process by using a nitrogen-containing target material that does not release oxygen under ion bombardment, while still allowing oxygen incorporation from the process gas to form the desired metal oxide layer
2Quantity of substance
If metallic targets are used in an oxygen-containing sputtering atmosphere, then metal oxide layers can be deposited, but oxygen accumulates on the target surface and is released by ion bombardment causing high-energy bombardment of the substrate
Solution Approach 1:
The target material composition is changed from metallic to nitrogen-containing ceramic, which fundamentally alters the interaction with oxygen. The nitrogen-containing target does not accumulate oxygen on its surface like metallic targets do, thereby preventing the release of high-energy oxygen atoms during sputtering
3Reliability
If fast reactive gas control is used to maintain stable operating point, then process control is attempted, but the process tips out of the hysteresis range causing changes in deposition rate and layer properties
Solution Approach 1:
The target material is changed from metallic to nitrogen-containing ceramic, which fundamentally alters the process characteristics and eliminates the hysteresis effect. This parameter change in target composition stabilizes the deposition process across a wider range of operating conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the deposition process, reduces mechanical stresses, and enhances the chemical and mechanical stability of the metal oxide layers, ensuring high transparency and durability, particularly suitable for antireflection layers in thermal insulation glazing and other applications.
Implementation Method 1
Material is removed from a conductive material, which is referred to as a target, by ion bombardment. This material condenses on a surface of a nearby substrate, thus forming a thin film on the substrate surface.
Implementation Method 2
Material is removed from a conductive material, which is referred to as a target, by ion bombardment.
Data Source
Figure 1~2
Figure 3a~3c
Figure 4~5
AI summary
The invention relates to a method for producing a coated object (1) by depositing at least one metal oxide layer (3, 4) on a substrate (2). First, an oxygen-containing sputtering atmosphere is created in a coating chamber. A metal oxide layer is deposited on the substrate in said sputtering atmosphere by sputtering a nitrogen-containing, ceramic target.